Installation guide

VMBME102

11.2 Components

DHP-AL is a heat pump installation for both heating and producing domestic hot water for the home. The heat pump uses outdoor air as a

heat source and retrieves energy from the air using an air heat exchanger in a separate outdoor unit.

The compressor in the heat pump is first compressor on the market that is specially developed for heat pumps. It also has an integrated

electrical heating element which provides auxiliary heat that can be used when the heating requirement exceeds the capacity of the heat

pump. The heat pump supplies as much of the heat demand as possible before auxiliary heating is engaged and assists.

The heat pump is equipped with control equipment, which is controlled via a control panel. The control equipment controls the heat pump

unit’s included components (compressor, circulation pumps, auxiliary heater and outdoor unit) and determines when to start and stop the

pump as well as producing heat and cooling for the house.

Heat enters the house via a water borne heating system, a low temperature system. One is used to cool the house. The heat pump’s func-

tion for cooling connects automatically when the outdoor temperature exceeds the set parameter.

The heat pump unit consists of five basic units:

1 Heat pump unit

• Scroll compressor

• Stainless steel heat exchanger (evaporator and condenser)

• Circulation pumps for brine and heating systems

• Valves and safety equipment and corresponding electrical components.

2 Auxiliary heat

• 15 kW electric heating element (4.5 kW at 230 V heat pump installation)

• Electric heating element control in a maximum of five steps (three steps

for 230 V heat pump installation)

• Installed on the heating system’s supply pipe

• Covers the demand of extra energy if the heat pump’s capacity is

exceeded

• Automatically connected in the heat pump unit if operating mode AUTO

is selected.

3 Control equipment (not shown in the figure)

• Control computer with graphic display

• Temperature sensors (outdoor, supply pipe, return pipe, brine and hot

water)

• Room sensor (option)

4 Water heater

• Water heater with defrosting tank

5 Outdoor unit

• Air heat exchanger

• Fan

Figure 44: The basic units of the heat pump.

11.3 Outdoor unit

Because the heat source for DHP-AL is outdoor air, the heat pump is equipped with an outdoor unit where the brine circuit retrieves energy

from the air. During operation, cold brine is heated in the air heat exchanger. To speed up brine heating, the outdoor unit is equipped with

a fan which increases the air flow through the air heat exchanger. The fan is controlled at two speeds by the control equipment in the heat

pump.